CH706982A2

CH706982A2 - Device for conditioning running surface of e.g. downhill ski, has dressing tool formed from metallic compound with embedded hard materials, where compound includes resonance frequency that approximately matches to sonotrode and/or holder

Info

Publication number: CH706982A2
Application number: CH01575/13A
Authority: CH
Inventors: Johannes Hoefflin
Original assignee: Ernst Knoll Feinmechanik Gmbh
Priority date: 2012-09-26
Filing date: 2013-09-13
Publication date: 2014-03-31
Also published as: CH706982B1; ITMI20131566A1; AT513403A2

Abstract

The device (1) has a rotatable grinding disk or roller (2) including a grinding covering (3), which is rotational symmetric at a rotational axis. A dressing tool (4) i.e. rotary roller-like dressing tool, is arranged at an end of a sonotrode (8) of an ultrasonic transducer (6) by a holder. The dressing tool is formed from a metallic compound with embedded hard materials. The metallic compound includes a resonance frequency, which approximately matches to the sonotrode and/or the holder. The hard materials are grains, which are made of cubic boron nitride, diamond, ceramic and/or hard metal. An independent claim is also included for a method for conditioning a running surface of a board-like winter sports device.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a device for conditioning the tread of a board-shaped winter sports device according to the preamble of claim 1.

[0002] The invention also relates to a method for conditioning the tread using the initially mentioned device according to claim 12.

[0003] The running surface of a ski substantially determines its driving characteristics. Therefore, various methods and devices have already been developed with which the running surface regularly made of a plastic material and in most cases equipped with metallic edges can be conditioned. The term "conditioning" refers to the cleaning or leveling of the tread, the incorporation of a profile or a structure into the tread, or any combination of these processing steps.

BACKGROUND OF THE INVENTION The process and devices known for conditioning a running surface have, as shown, for example, DE 2011 6 302 U1, a rotatable grinding wheel or roller which has a grinding surface which is rotationally symmetrical with respect to its axis of rotation and which has a ceramic, Metallic bond with abrasive grains embedded therein. By contacting the dressing tool, a profile or a structure can be incorporated in the grinding wheel or roller into the grinding wheel or roller, with which a corresponding structure or a corresponding profile is subsequently incorporated into the running surface of the at least one ski.

[0005] However, the previously known methods and devices are connected with a comparatively large mechanical overlay in order to align and profile the grinding wheel and then to transfer the profile machined into the grinding wheel to the tread of at least one ski. The previously known methods and devices are associated with a comparatively great wear of the dressing tool and with a correspondingly large abrasion.

SUMMARY OF THE INVENTION It is therefore an object of the invention to provide a device and a method of the type mentioned at the outset which simplify or accelerate the mechanical and time expenditure associated with the conditioning of the tread of board-shaped winter sports equipment and that tread as precisely as possible the desired profile Or the desired structure.

[0007] The solution according to the invention is achieved according to the features of patent claim 1.

The device according to the invention has a rotatable grinding wheel or roller which is provided for conditioning the running surface of at least one board-shaped winter sports device, for example a ski, a snowboard, a snowblade, a snowglove or a so-called bigfoot. The grinding wheel or roller has an abrasive coating which is rotationally symmetrical with respect to its axis of rotation and has a ceramic, organic or metallic bond with abrasive grains embedded therein. In this case, the abrasive grains of the abrasive lining and / or its binding during a dressing operation can be partially or completely broken by means of a dressing tool which can be brought into engagement with the abrasive lining, That the grinding pad assumes a structure or corresponding profile corresponding to the profile or structure to be machined into the running surface of the winter sports device. According to the invention, it is provided that the dressing tool is made of a metallic bond with hard materials incorporated therein. In tests, it has been found that only a metallic bond of the hard materials provided in the dressing tool is able to withstand the stresses which arise when dressing the grinding wheel required to condition the running surface of a winter sports device. The comparatively soft metal edge on the longitudinal sides of the winter sports device on the one hand and the hard running surface on the other hand present special challenges on account of their contrasting material properties. Since the plastic used for producing the running surface is very compliant and tough, a grinding wheel with a very sharp grinding surface and correspondingly pointed abrasive grains is required. Such pointed abrasive grains, however, wear easily on the comparatively soft steel edge. Since the hard materials bound in the dressing tool are held firmly in the dressing tool because of the metallic bond, comparatively fine-grained hard materials can also be used for the dressing tool, which protrude less from the surface of the dressing tool and are therefore exposed to less wear. In order to be able to apply the energy required for dressing the grinding wheel largely without loss and if possible without any major heat development by means of the dressing tool, Characterized in that these components of the dressing tool, namely the metallic bond with the hard materials incorporated therein, have approximately the same resonance frequencies as the sonotrode and / or the holder. In this case, a resonant frequency which is approximately the same is understood to be such a natural frequency of these constituents which correspond almost without loss to each other. If, on the other hand, the natural frequencies differ widely, unwanted vibration dissonances arise between the components of the dressing tool, by means of which the hard materials bound in the dressing tool are released from the binding and thus the tool life is reduced. Since the different winter sports equipment, such as a ski on the one hand and a cross-country skiing on the other hand, Must be differently conditioned, and since the grinding wheel required for this purpose has to be arranged differently, it is provided according to the invention that the dressing tool arranged at one end of a sonotrode of an ultrasound vibrator is detachably and in particular replaceably held in the device. In this case, the dressing tool and sonotrode can form a unit detachably held in the device and, for example, be manufactured in one piece, but it is also possible that the dressing tool itself is detachably held on the sonotrode. Characterized in that the dressing tool arranged at one end of a sonotrode of an ultrasonic vibrator is releasably and, in particular, replaceably held in the device. In this case, the dressing tool and sonotrode can form a unit detachably held in the device and, for example, be manufactured in one piece, but it is also possible that the dressing tool itself is detachably held on the sonotrode. Characterized in that the dressing tool arranged at one end of a sonotrode of an ultrasonic vibrator is releasably and, in particular, replaceably held in the device. In this case, the dressing tool and sonotrode can form a unit detachably held in the device and, for example, be manufactured in one piece, but it is also possible that the dressing tool itself is detachably held on the sonotrode.

[0009] In order for the dressing tool to withstand the stresses which occur for as long as possible, it is expedient if the hard materials used for the dressing tool are grains which consist of cubic boron nitride, ceramic, diamond and / or hard metal.

[0010] It is possible that the sonotrode and the dressing tool held on a support at one end of the sonotrode are held interchangeably in the device. However, in order to reduce the complexity associated with the storage of different dressing tools, a preferred embodiment according to the invention provides that the dressing tool is held detachably and exchangeably at one end of a sonotrode of an ultrasound oscillator, possibly via a holder.

A stationary dressing tool can also be used for dressing the grinding wheel. However, a preferred embodiment according to the invention provides that the dressing tool is configured as a rotating roller-shaped aligning tool.

[0012] DE 10 2011 115 006 discloses a device for conditioning grinding tools with rotational-geometric geometry, the abrasive coating of which has a ceramic, organic or metallic bond. However, such devices are used only for dressing the grinding tools required for comparatively coarse grinding operations, whereas the device according to the invention is, in contrast, designed for the microprocessing of the tread of a winter sports device in which the tread is to be given a barely perceptible structure or profiling.

In order to be able to provide the running surface of a winter sports equipment at least over a partial range of its longitudinal extent with the desired profile or the desired structure, it is expedient if the dressing tool is complementary to the desired profile or structure relative to the grinding disc or roller during the dressing operation Of the grinding surface of the grinding wheel or roller.

In order to provide the desired profile or the desired structure to the grinding pad of the grinding wheel or roller, it may be advantageous if the grinding wheel or roller is provided during the dressing process relative to the dressing tool in a manner complementary to the desired profile or to the desired structure of its dressing Grinding surfaces.

However, a preferred procedure provides that the axis of rotation of the grinding wheel or roller is held stationary during the dressing process, and the dressing tool is moved along an X and / or Y axis.

A preferred procedure provides that the amplitude of the dressing tool is 10 nm to 1 mm, preferably a few micrometers.

The dressing on the dressing tool can be reduced if at least the dressing tool is made of hard metal, ceramic, polycrystalline diamond, CVD (chemical vapor deposition) diamond, natural diamond or similar hard material on its dressing tool section facing the grinding wheel or roller.

[0018] In the device according to the invention, the dressing tool is provided at one end of a sonotrode of an ultrasound vibrator. With the aid of the ultrasonic oscillator, the dressing tool can be vibrated in such a way that the surface structure of the grinding wheel or roller can be processed and deformed in the desired manner.

In order to be able to incorporate the desired profile into the tread of a board-shaped winter sports device, it is expedient for the dressing unit having the ultrasonic oscillator, the sonotrode and the dressing tool to be arranged on a grinding wheel or roller stationary therefrom, preferably along an X- and / Or Y-axis.

In the method mentioned at the outset, the solution according to the invention consists in the use of the above-described device for conditioning the running surface, at least one board-shaped winter sports device, for example a ski.

[0021] Further developments according to the invention result from the claims in connection with the description as well as the drawing. The invention is described in more detail below with reference to a preferred exemplary embodiment.

The sole FIGURE shows a device for conditioning the tread of at least one ski by means of at least one rotatable grinding wheel or roller, the grinding surface of which is excited by ultrasound with the aid of a dressing tool during the dressing process.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a device 1 for conditioning the running surface of at least one board-shaped winter sports device in a simplified illustration. The winter sports equipment to be processed can be designed as a ski, snowboard, snowblade, firnglider, bigfoot or the like. The device 1 has at least one grinding wheel or roller 2 which is rotatable about a rotational axis by means of a motor drive. The grinding wheel or roller 2 has one

Claims

Of its rotational axis, which has a ceramic, organic or metallic bond with abrasive grains embedded therein. In order to be able to prepare the grinding surface 3 of the grinding wheel or roller 2 and to be provided, for example, with a profile or a structure, with which the grinding wheel or roller, which acts upon the winter sports machine, is to incorporate a corresponding profile or a corresponding structure in its tread Dressing tool 4 is provided which is produced at least on its dressing tool section facing the grinding wheel or dressing 5 made of hard material, the dressing end 5 being engageable with the grinding pad 3, That the binding and / or the abrasive grains of the abrasive lining 3 can be partially or completely broken during a dressing operation by means of the dressing tool. [0025] The dressing tool is made of a metallic bond with hard materials incorporated therein. For this purpose, grains which consist of cubic boron nitride, hard metal, diamond or ceramic are used as hard materials. The dressing on the dressing tool can be reduced if at least the dressing tool is made of hard metal, ceramic, polycrystalline diamond, CVD (chemical vapor deposition) diamond, natural diamond or similar hard material on its dressing tool section facing the grinding wheel or roller. [0026] In order to excite the dressing tool 4 at its dressing end 5, An ultrasonic oscillator or transducer 6 is provided whose vibrations can be amplified if necessary in a booster 7 and can be converted into lifting movements in a sonotrode 8 which is operatively connected to the ultrasonic transducer 6 and which lifting motions are aligned with the surface of the abrasive lining 3. In order to be able to apply the energy required for dressing the grinding wheel to the grinding wheel with the aid of the dressing tool 4 as little as possible without loss and to achieve the longest possible life of the dressing tool 4, the components of the dressing tool 4, namely the metallic binding, Hard materials, a resonance frequency which is approximately the same as the sonotrode 6 and possibly to a holder required for holding the dressing tool. While the axis of rotation of the grinding wheel or roller is held statically during the dressing process in the device 1, the dressing tool 4 can be moved along an X and / or Y axis by means of an XY adjusting unit 9. The adjusting movement of the dressing tool 4 in the direction of the grinding wheel or roller to be processed can be monitored by means of an acoustics sensor, which is optionally connected to the at least one motor drive of the X and / or Y adjusting unit 9 via a control device Of the dressing tool section 5 on the grinding wheel. It is advantageous if the frequency of the mechanical oscillation of the dressing tool is 41 kHz to 1 MHz. The vibrations of the ultrasonic transducer can thereby be converted into lifting movements on the dressing tool 4 such that the amplitude of the dressing tool at its dressing end 5 is preferably 10 nm to 1 mm. In order for the dressing tool 4 with its dressing end 5, which is made of hard material, to also process and form a hard grinding surface, it is advantageous if the dressing end 5 has hard metal, ceramic, polycrystalline diamond, CVD diamond, natural diamond or similar hard material. Since the dressing end is stimulated by ultrasound during the dressing process, the desired profile can be incorporated into the tread of the winter sports device with high accuracy. In this case, the apparatus and time expenditure, Which is needed to condition the tread of the at least one winter sports device. The monitoring of the dressing and grinding process is important and helps during the dressing process to obtain the requisite information on the progress of the dressing process and the condition of the ski to be machined. The dressing and grinding process can be monitored in a simple manner with the aid of such sensors, which can in particular be designed as AE sensors, ie as acoustic emission sensors. The sensor system can be integrated into the device. claims The required information about the progress of the dressing process and the condition of the ski to be processed. The dressing and grinding process can be monitored in a simple manner with the aid of such sensors, which can in particular be designed as AE sensors, ie as acoustic emission sensors. The sensor system can be integrated into the device. claims The required information about the progress of the dressing process and the condition of the ski to be processed. The dressing and grinding process can be monitored in a simple manner with the aid of such sensors, which can in particular be designed as AE sensors, ie as acoustic emission sensors. The sensor system can be integrated into the device. claims

1. A device for conditioning the tread of at least one board-shaped winter sports device by means of a rotatable grinding wheel or roller which has a grinding pad which is rotationally symmetrical with respect to its axis of rotation and has a ceramic organic or metallic bond with abrasive grains bound therein , Wherein the binding or the abrasive grains of the abrasive lining (3) can be partially or completely broken during a dressing operation by means of a dressing tool (4) made of hard material which can be brought into engagement with the grinding pad (3), characterized in that the binding tool Sonotrode (6) of an ultrasonic oscillator is held in the device by means of a mount,Characterized in that the dressing tool (4) is made of a metallic bond with hard materials incorporated therein, and that the metallic bond with the hard materials of the dressing tool (4) incorporated therein have a resonant frequency that is approximately equal to the sonotrode (6) or the mount.

2. The device according to claim 1, characterized in that the hard materials used in the dressing tool are grains which consist of cubic boron nitride, diamond, ceramic and / or hard metal.

3. The device according to claim 1, wherein the dressing tool is detachably and replaceably held at one end of a sonotrode of an ultrasonic oscillator.

4. The device as claimed in claim 1, characterized in that the dressing tool and the sonotrode form a unit detachably held in the device.

5. Device according to one of claims 1 to 4, characterized in that the dressing tool is designed as a rotating roller-shaped dressing tool.

6. The device according to claim 1, wherein the grinding wheel or roller (2) can be displaced relative to the desired profile or to the desired structure of its grinding surface (3) relative to the dressing tool during the dressing process.

7. The device according to claim 1, wherein the dressing tool (4) can be displaced relative to the desired profile or the desired structure of its abrasive lining (3) relative to the grinding wheel or roller (2) during the dressing process.

8. The device as claimed in claim 1, characterized in that the axis of rotation of the grinding wheel or roller (2) is held stationary during the dressing process, and the dressing tool (4) can be moved along an x- and / or y-axis.

9. The device as claimed in claim 1, characterized in that the frequency of the mechanical oscillation of the dressing tool (4) is 1 kHz to 1 MHz.

10. The device as claimed in claim 1, wherein the amplitude of the dressing tool (4) is 10 nm to 1 mm.

11. Device according to claim 10, characterized in that the dressing unit comprising the ultrasonic oscillator (13), the sonotrode (8) and the dressing tool (4) is arranged on an adjusting unit (9) which is movable opposite the stationary grinding wheel or roller (2) is.

12. A method for conditioning the tread of at least one board-shaped winter sports device using a device according to at least one of claims 1 to 11.